feat: head reporter metrics via beholder metrics - #23250
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makramkd
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Jul 28, 2026
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| // evmMetricsReporter records head/finality data for in-process EVM chains as Beholder metrics, | ||
| // driven by HeadTracker's new-head events. | ||
| type evmMetricsReporter struct { |
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Should Beholder be in the name somewhere?
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makramkd
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July 30, 2026 08:34
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What
Part of the OTI deprecation story https://smartcontract-it.atlassian.net/browse/CCIP-12500
Adds two new
HeadReporterimplementations that emit head/finality data as Beholder OTel metrics (viabeholder.GetMeter()), alongside the existing OTI-based reporters:evmMetricsReporter— event-driven, in-process EVM chains (mirrorslegacyEVMTelemetryReporter).relayerMetricsReporter— periodic poll over LOOP relayers, e.g. Solana/Aptos (mirrorsloopTelemetryReporter).Reasoning:
evmMetricsReporterandrelayerMetricsReportermirror the existinglegacyEVMTelemetryReporter/loopTelemetryReportersplit: EVM has a realHeadTrackersubscription (event-driven), while LOOP relayers (Solana/Aptos/etc.) have no in-process tracker and must be polled on the periodic tick.Both record via a shared
HeadMetricssink (beholderHeadMetrics) that registers 5Int64Gaugeinstruments once at construction.Wired into
application.goalongside the existing reporters; ifNewBeholderHeadMetrics()fails, we log and skip the metrics reporters rather than failing app startup.Testing
Unit tests for both reporters with a mocked
HeadMetrics, plus an instrument-level test using an OTelManualReaderto verify actual gauge values/attributes end to end.